期刊
NATURE COMMUNICATIONS
卷 12, 期 1, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41467-021-22777-x
关键词
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资金
- National Key Research and Development Program of China [2016YFA0300803, 2017YFA0206304]
- National Basic Research Program of China [2014CB921101]
- National Natural Science Foundation of China [61427812, 11774160, 11574137, 61474061, 61674079, 11904174]
- Jiangsu Shuangchuang Program
- Natural Science Foundation of Jiangsu Province of China [BK20140054, BK20190729]
- NUPTSF [NY219024]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [19KJB510047]
- UK EPSRC [EP/S010246/1]
- leverhulme Trust [LTSRF1819\15\12]
- Royal Society [IEC\NSFC\181680]
- US National Science Foundation (NSF-DMR) [1809160]
- U.S. Department of Energy, Basic Energy Sciences [DE-SC0019114]
- Ministry of Science and Technology (MOST) in Taiwan [MOST108-2636- M-006-002]
- National Center for Theoretical Sciences, Taiwan
- MOST, Taiwan [MOST107-2627-E-006-001]
- Higher Education Sprout Project, Ministry of Education
- [MM22532]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1809160] Funding Source: National Science Foundation
Growth and properties of single- and few-layer CrTe2 on bilayer graphene by molecular beam epitaxy (MBE) have shown intrinsic ferromagnetism with a Curie temperature up to 300 K and perpendicular magnetic anisotropy, providing a new avenue for developing large-scale 2D magnet-based spintronics devices.
While the discovery of two-dimensional (2D) magnets opens the door for fundamental physics and next-generation spintronics, it is technically challenging to achieve the room-temperature ferromagnetic (FM) order in a way compatible with potential device applications. Here, we report the growth and properties of single- and few-layer CrTe2, a van der Waals (vdW) material, on bilayer graphene by molecular beam epitaxy (MBE). Intrinsic ferromagnetism with a Curie temperature (T-C) up to 300 K, an atomic magnetic moment of similar to 0.21 mu(B)/Cr and perpendicular magnetic anisotropy (PMA) constant (K-u) of 4.89 x 10(5) erg/cm(3) at room temperature in these few-monolayer films have been unambiguously evidenced by superconducting quantum interference device and X-ray magnetic circular dichroism. This intrinsic ferromagnetism has also been identified by the splitting of majority and minority band dispersions with similar to 0.2 eV at Gamma point using angle-resolved photoemission spectroscopy. The FM order is preserved with the film thickness down to a monolayer (T-C similar to 200 K), benefiting from the strong PMA and weak interlayer coupling. The successful MBE growth of 2D FM CrTe2 films with room-temperature ferromagnetism opens a new avenue for developing large-scale 2D magnet-based spintronics devices.
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